You can edit a couple of text files for a quick change, in this example I have adjusted 2 screens to place more crosshair commands.

1. Moved two sections, "Viewmodel Preset" and "ClanTag" from the Game options screen to the Video Options screen.

2. Adjusted items and added new controls for the crosshairs.

Game Settings	Video Settings

I have a download of the files, below is the readme info found in the file.

Counter-Strike: Global Offensive Game settings and Video GUI edits.

Adjusts a couple of text files to add Crosshair items to the CS:GO Menus in the GUI.

For testing ONLY. CS:GO is a new game and server kicks, updates and even VAC bans may be possible.
I have not been VAC banned, I have been kicked on sv_pure 1 servers, updates changed these files in two days...twice!

<<<<<USE AT YOUR OWN RISK>>>>>

***********************
Warning 1: Files may change at any time in an up date.

Back up the original files before proceeding.

   1. Go to ...
C:\Program Files (x86)\Steam\steamapps\common\Counter-Strike Global Offensive\csgo\scripts   OR....
C:\Program Files\Steam\steamapps\common\Counter-Strike Global Offensive\csgo\scripts

   2. Copy and put away two files....

    game_options.txt and video_options.txt

I have placed these two files in the download... 23 Aug 2012 they may update...so better to use your own.

***********************

Warning 2.
I have seen these files blocked on sv_pure 1 servers. <<<<<USE AT YOUR OWN RISK>>>>>

***********************

As far as I know they are VAC OK.

The file edits:
As you may know CS:GO GUI and HUD files are mostly Flash based and are a different animal to older Source engine games.
However, before we all go nuts with ScaleForm and decompiling the flash files, look at other areas too.

Just edit these simple format files and you can effect a change in the GUI screens. This is sort of like editing the " settings" file in CSS.

    }

    "Crosshair Thickness - Classic Only"     // name of the section
    {
        "name"            "Crosshair Thickness - Classic Only"    // name seen in the GUI
        "convar"        "cl_crosshairthickness"  // the CVAR
        "priority"        "0503"   // name place in the GUI page 502 is above and 503 would be the next section.
        "type"            "choice" // Type of button action (you can have sliders too)
        "choices"
        {    
            "0.5 - Thin Line/Tiny Dot"  "0.5"    // the CVAR choices, the seen title and the cvar value.... "ON"    "1"
            "1 - Med Line/Small Dot"    "1"            
            "2 - Large Line/Med Dot"    "2"
            "3 - Huge Line/Big Dot"     "3"                
        }
    }